<?php
if (is_object($in)) {
    $class = get_class($in);
    if ($class !== $this->type) {
        $reflection = new ReflectionClass($class);
        return $reflection->isSubclassOf($this->type) ||
            $reflection->implementsInterface($this->type);
    }
    return true;
}
return gettype($in) === $this->type;

<?php
if (is_object($in)) {
    $class = get_class($in);
    if ($class !== $this->type) {
        $reflection = new ReflectionClass($class);
        return $reflection->isSubclassOf($this->type) ||
            $reflection->implementsInterface($this->type);
    }
    return true;
}
return gettype($in) === $this->type;

!$in instanceof $this->type

!$in instanceof $this->type